Does the NVIDIA Quadro FX 5600 1.5 GB. meet Blender 2.8 minimum system requirements?
I'm not sure about that specific card but it should work even if it is legacy (cycles GPU compute may not work Eevee will still work). I have a  Quadro 2000 and blender works fine on mine (for most work loads). After looking at comparisons between the 2 the Quadro FX 5600 is better than mine therefore it should work with blender.
Graphics support